modifications to G, apparent stiffness?
modifications to G, apparent stiffness?
(OP)
I'm having trouble reconciling wood shear wall deflection calculations done according to equation (4.3-1) of the AFPA SDPWS-2008. My software result doesn't match my hand calcs and spreadsheet so i wonder if I'm missing something.
Specifically, are there modifications that must be done to G, apparent shear stiffness, from table 4.3A that would make my numbers screwy? There are footnotes to the table, but any other adjustments I should be considering in my calcs?
Specifically, are there modifications that must be done to G, apparent shear stiffness, from table 4.3A that would make my numbers screwy? There are footnotes to the table, but any other adjustments I should be considering in my calcs?






RE: modifications to G, apparent stiffness?
That walks you through the nitty-gritty details about how they came up with the Ga values. Note: you can assume different levels of fastener slip (if you like) and develop your own alternative Ga values.
RE: modifications to G, apparent stiffness?
It's interesting to note that one can use an alternative fastener slip value, Vn. Have you done this by using the actual fastener load per nail rather than 1.4Vs(ASD) in the equation?
RE: modifications to G, apparent stiffness?
Also, the concept should, of course, be valid for other panels and fastener spacing and such. It's been a while since I did these calcs, so I can't easily point you towards any stumbling blocks. Just that it should work and that I remember it working when I did it back when.
RE: modifications to G, apparent stiffness?
For the benefit of anybody else who stumbles on this thread: The divisor and exponent in the equation for e(sub)n changes with sheathing thickness according to Table C4.2.2D.